@BOOK{penha:2005,
  AUTHOR    = {{Ricardo Pe\~{n}a}},
  TITLE     = {{Dise\~{n}o de Programas: Formalismo y Abstracci\'{o}n}},
  PUBLISHER = {Pearson Educacion},
  YEAR      = {2005},
  edition   = {3},
}

@BOOK{brasard:2000,
  AUTHOR    = {Gille Brasard and Paul Bratley},
  TITLE     = {{Fundamentos de Algoritmia}},
  PUBLISHER = {Prentice Hall},
  YEAR      = {2000},
}
